CN103837827B - Fault operation test device of flexible direct current transmission valve - Google Patents
Fault operation test device of flexible direct current transmission valve Download PDFInfo
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- CN103837827B CN103837827B CN201410109433.0A CN201410109433A CN103837827B CN 103837827 B CN103837827 B CN 103837827B CN 201410109433 A CN201410109433 A CN 201410109433A CN 103837827 B CN103837827 B CN 103837827B
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Abstract
The invention relates to a fault operation test device of a flexible direct current transmission valve. The fault operation test device comprises a decay current injection loop, a sinusoidal current injection loop and a high voltage injection loop. The high-voltage side of a tested valve is respectively connected with a control valve S1 in the decay current injection loop, a bidirectional control valve S3 in the sinusoidal current injection loop and a bidirectional control valve S4 in the high voltage injection loop. The low-voltage side of the decay current injection loop, the low-voltage side of the sinusoidal current injection loop and the low-voltage side of the high voltage injection loop are respectively connected with the low-voltage side of the tested valve and are earthed. The fault operation test device enables the tested valve to withstand a transient current, transient heat and loss strength similar to real fault working conditions, achieves the test and evaluation to the valve under the fault operation working conditions, and meanwhile, provides a basis for a main circuit parameter design and a protective design. By the adoption of the test device, amplitude, rise time and a decaying process of the decay current can be adjusted according to real working conditions, and the requirement of testing versatility can be achieved.
Description
Technical field
The present invention relates to a kind of assay device of flexible direct current power transmission system valve.
Background technology
Modular multi-level converter (modular multilevel converter, mmc), can due to its expansibility
Realize the redundancy under fault state, it has received significant attention it is considered to be realizing flexible DC power transmission since proposing from 2003
(hvdc-flexible) one of inverter topology of through engineering approaches.The brachium pontis of mmc is not only carried out the valve of switch motion, Er Qieshi
It is connected to the controllable voltage source between current transformer cross streams outfan and dc bus.Every phase bridge arm unit is by several valve towers
Constitute with a valve reactor, each valve tower is become by several valve modules, is independent support section, each valve module is by some
Submodule is in series.The core devices of submodule are high-power high voltage insulated gate bipolar transistor (igbt), also referred to as module
Change Multilevel Inverters valve (mmc valve).In normal operating condition, submodule, by the cooperation of upper and lower two igbt, exports two
Plant level: 0 level and condenser voltage.
In the actual motion of the flexible direct current power transmission system (mmc-hvdc) based on modular multi-level converter, can send out
Life causes brachium pontis overcurrent due to reasons such as the system failure, dc-side short-circuit faults, and now the igbt of all submodules of brachium pontis is equal
Locking, brachium pontis overcurrent can constitute loop by the diode of down tube igbt in submodule with outside, due to diode can not
, it is impossible to itself turns off overcurrent, simultaneously because system protection is longer for movement time, chopper is also not operating, and diode must for control property
The overcurrent during fault must be born.Due to overcurrent during fault can considerably beyond the tolerance value of device itself it is therefore necessary to
Most overcurrent is shared by protection IGCT action antiparallel with down tube igbt in submodule, to reach protector
Part itself and the purpose of device.
Because flexible DC power transmission device generally has, voltage is high, electric current is big, capacity is big, is difficult in experimental enviroment
Middle structure entirely carries circuit with actual operating mode identical and carries out Test to Failure it is therefore necessary to build equivalent in experimental enviroment
Hookup, carries out the test suitable with actual operating mode intensity.
The fault current operation test purpose of modular multi-level converter valve is exactly to test when fault current occurs, control
System energy locking igbt in time processed, triggers IGCT simultaneously, protects the antiparallel diode of submodule down tube igbt, verify simultaneously
Whether the design that each functional parameter of mmc submodule acts on to maximum current, voltage and temperature stress is suitable.Must be by outer in test
Enclose circuit and inject high current and reverse high voltage under actual condition to tested valve.
Patent 201110036675.8 " a kind of fault current running test method of flexible DC power transmission mmc valve " proposes one
Plant assay device, its device is by decay current infusion circuit, sinusoidal current infusion circuit, high voltage infusion circuit and test product valve group
Become.Bidirectional control valve v2 in control valve v1 in decay current infusion circuit, sinusoidal current infusion circuit and high voltage injection
Bidirectional control valve v3 in loop is connected with the outfan of test product valve respectively；The low-pressure end of decay current infusion circuit, sinusoidal electricity
The low-pressure end of multiple abscess entry loop is grounded after being connected with the low-pressure end of test product valve respectively with the low-pressure end of high voltage infusion circuit.Decay
Electric current infusion circuit includes power supply e1, charge switch kc1, direct current capacitors c1, load reactance device l1, control valve v1, integrated door
Pole converter valve transistor igct, damping resistance r and diode d；Power supply e1 is through charge switch kc1 and direct current capacitors c1 even
Connect；Igct anti-paralleled diode d forms turn-off device g；Turn-off device g is connected with damping resistance r, forms g-r branch road；g-
R branch road and the outfan being connected through overload reactor l1 and control valve v1 after direct current capacitors c1 parallel connection with test product valve.This dress
The topology putting decay current infusion circuit is connected with inductance for after resistance capacitance parallel connection, i.e. rc-l topology.After on-test, decline
Powered down multiple abscess entry loop always works under a kind of this topological mode.In order that on-test stage current has goes up raising speed faster
Rate keeps that follow-up decay current rate of decay is slower simultaneously, and the selection of inductance l and resistance r is relatively difficult.Meanwhile, electricity in this circuit
The instantaneous power that resistance r consumes and total energy are all very big, and system need to be equipped with stronger cooling system.For obtaining certain numerical value
High current, the pre-charge voltage of electric capacity can very big it is desirable to electric capacity to have more pressure than larger.When decay current infusion circuit exits
During operation, electric capacity has certain reverse charging voltage, is unfavorable for safe operation.
Proceedings of the CSEE volume 31 the 1st phase document " modularization multi-level converter hvdc DC bipolar short circuit
Module overcurrent analyze " analysis result show, flexible direct current power transmission system occur DC side bipolar short trouble when, every phase
Brachium pontis works in both modes: 1 submodule electric capacity is to brachium pontis inductance and the electric discharge of circuit stray resistance；2 is upper and lower when submodule
After igbt locking, inductive current is discharged by stray resistance.I.e. brachium pontis mode of operation is rlc+rl pattern.In whole process, electricity
Net side injects alternating current to upper and lower bridge arm.
Content of the invention
The purpose of the present invention is that the parameter simplifying existing assay device selects, the work of brachium pontis during simulation real system fault
Pattern, proposes a kind of topology of the flexible direct-current transmission valve fault current assay device based on modular multi-level converter.This dress
Put and put on exponential decay current, sinusoidal current superposition on tested modular multi-level converter valve, make tested valve tolerance same
The suitable transient current of physical fault operating mode, the heat of transient state and loss intensity, realize the examination of the accident operating condition to tested valve
Test examination.
When occurring for more preferable simulated failure, flow through the overcurrent of down tube igbt anti-paralleled diode, test method of the present invention
The mechanism producing decay is by triggering control valve, so that electric capacity is discharged to inductive resistance, by controlling the conducting of turn-off device
In the moment, make the mode of operation of decay current infusion circuit be changed into inductance and pass through resistance afterflow.Therefore, decay current infusion circuit
Operational mode simulates the mode of operation of brachium pontis during fault.By the discharge and recharge of electric capacity in sinusoidal current infusion circuit and inductance,
The alternating current of grid side injection during simulated failure.The selection of decay current infusion circuit parameter refers to the parameter of brachium pontis.When
When decay current infusion circuit is deactivated, the energy on inductance is consumed by bleeder resistance, and electric capacity does not have voltage, this
Be conducive to the safety operation of system.
The technical solution used in the present invention is:
Described assay device includes decay current infusion circuit, sinusoidal current infusion circuit and high voltage infusion circuit.
The outfan of tested valve is injected with described decay current infusion circuit, sinusoidal current infusion circuit and high voltage respectively
Loop connects；The low-pressure end of described decay current infusion circuit, the low-pressure end of sinusoidal current infusion circuit and high voltage inject back
The low-pressure end on road is grounded after being connected with the low-pressure end of tested valve respectively.
Decay current infusion circuit includes the first power supply, the first charge switch, the first direct current capacitors, the first load reactance
Device, damping resistance, the first control valve, turn-off device, bleeder resistance, diode；First power supply through the first charge switch with
First direct current capacitors connects；Turn-off device is in parallel with bleeder resistance, with Diode series, forms gr-d branch road；Gr-d props up
Road second control valve is in parallel with direct current capacitors；Gr-d branch road is through the first load reactance device, damping resistance and the second control valve
It is connected with the outfan of tested valve.
Sinusoidal current infusion circuit includes second source, the second charge switch, the second direct current capacitors, the second load reactance
Device and the first bidirectional control valve；Power supply is connected with the second direct current capacitors through the second charge switch；Second direct current capacitors warp
Cross the second load reactance device and the first bidirectional control valve is connected with the outfan of tested valve.
High voltage infusion circuit includes the 3rd power supply, the 3rd charge switch, the 3rd direct current capacitors, the 3rd load reactance device
With the second bidirectional control valve；Power supply is connected with the 3rd direct current capacitors through the 3rd charge switch；3rd direct current capacitors passes through
3rd load reactance device and the second bidirectional control valve are connected to the outfan of tested valve.
The outfan of tested valve respectively with described decay current infusion circuit in the first control valve, sinusoidal current injects back
The second bidirectional control valve in the first bidirectional control valve and high voltage infusion circuit in road connects；Described decay current injects back
The low-pressure end of the low-pressure end on road, the low-pressure end of the sinusoidal current infusion circuit and high voltage infusion circuit low pressure with tested valve respectively
End is grounded after being connected.
The work process of the present invention is as follows:
A, closure the first charge switch, the second charge switch and the 3rd charge switch, are given respectively by external dc power supply
First direct current capacitors of described device, the second direct current capacitors and the 3rd direct current capacitors charge, when capacitance voltage reach pre-
After definite value, disconnect the first charge switch, the second charge switch and the 3rd charge switch.
B, by controlling turn-off device, the first control valve, the second control valve triggering and conducting, turning off sequential so that first
Direct current capacitors, the first load reactance device l1, damping resistance be combined, produce decay current；By triggering bidirectional control valve,
So that sinusoidal current infusion circuit is worked, produce sinusoidal current；
C, trigger the cooperation of logical sequence by described decay current infusion circuit and sinusoidal current infusion circuit, make decay
Electric current is superimposed with sinusoidal current and puts on tested valve；
D, shutoff turn-off device, decay current infusion circuit is exited from circuit；Turn off the first bidirectional control valve
Trigger pulse, after sinusoidal current zero passage, sinusoidal current infusion circuit exits from circuit；In trigger high voltage infusion circuit
High voltage infusion circuit is put into by the second bidirectional control valve, and backward voltage is put on described tested valve.
The theing improvement is that of assay device of the present invention:
1st, described decay current infusion circuit produces decay current；Led by triggering the first control valve and the second control valve
Logical, so that decay current infusion circuit is worked；After the second control valve conducting, turn off its trigger pulse, and so that turn-off device is led
Logical.Decay current infusion circuit is made to work in both modes；It thes improvement is that, decay current infusion circuit work of the present invention
Operation mode is rlc+rl pattern, when more truly simulation physical fault occurs, flows through the overcurrent of valve.
2nd, control and turn off turn-off device, decay current infusion circuit is exited from circuit；It thes improvement is that, leads to
Cross control turn-off device, change circuit operational factor so that decay current is decayed rapidly, the first DC capacitor will not leave
Reverse charging voltage.
A kind of preferred technical scheme of the present invention is:
In described step a, the decay current that the first power supply, second source and the 3rd power supply are respectively described device injects back
First direct current capacitors of road, sinusoidal current infusion circuit and high voltage infusion circuit, the second direct current capacitors and the 3rd direct current
Capacitor charge, to be charged after the completion of disconnect first switch, second switch and the 3rd switch.
The preferred technical scheme of the present invention second is:
In described step b, trigger the first control valve in described decay current infusion circuit and the second control valve, by institute
State the first direct current capacitors and the resonance of load reactance device, damping resistance produces front end peak current；Can switching off device by triggering
Part, so that the first load reactance device is discharged by damping resistance, produces decay current；By decay current infusion circuit, generation declines
Powered down stream.
The preferred technical scheme of the present invention the 3rd is:
In described step c, trigger the first bidirectional control valve of described sinusoidal current infusion circuit, injected back by sinusoidal current
Road, produces sinusoidal current, triggers logical sequence by described first control valve, the second control valve and described first bidirectional control valve
Cooperation, make described decay current reach peak value time identical with the time that first sinusoidal current pulse reaches peak value, decline
Powered down stream continues to be superimposed with sinusoidal current to put on described tested valve.
The preferred technical scheme of the present invention the 4th is:
In described step d, when applying backward voltage, control and turn off turn-off device, described decay current is injected back
Road is exited from circuit, after sinusoidal current zero passage, the pulse of the first bidirectional control valve described in locking, and described sinusoidal current injection
Loop is exited from circuit, then triggers described second bidirectional control valve, high voltage infusion circuit is put into, backward voltage is applied
On described tested valve, until off-test.
Compared with prior art, the beneficial effect that the present invention reaches is:
1st, the decay current generation method that the present invention provides, simulates defeated based on modular multi-level converter flexible direct current
When there is DC side fault in electric system, the process that brachium pontis overcurrent produces, the front end peak current of generation and electric discharge decay current
Closer to real system break down when, the overcurrent that modular multi-level converter valve flows through.
2nd, the method that the present invention provides passes through a series of triggering cooperation of additional devices in hookup, by decay current and
Sinusoidal current superposition puts on tested converter valve, makes tested converter valve tolerance with the suitable transient current of physical fault operating mode, temporarily
The heat of state and loss intensity, realize the test examination to tested valve accident operating condition, and the test method that the present invention provides
Realization for different tests mode is convenient, simple, and the safety for assay device is highly beneficial；
3rd, the fault current based on modular multi-level converter flexible direct current power transmission system valve that the present invention provides runs
Test method fully meets the requirement of modular multi-level converter valve fault current test, it is possible to provide with actual operating mode phase
When transient state calorific intensity, transient fault current intensity, transient state high-voltage strength, accessory circuit loss intensity, current changing rate
(di/dt) intensity, voltage change ratio (dv/dt) intensity.
Brief description
Fig. 1 is the failure operation assay device schematic diagram of flexible direct-current transmission valve of the present invention；
Fig. 2 is the test current of failure operation assay device of flexible direct-current transmission valve of the present invention, voltage waveform.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and detailed description.
Fig. 1 is former based on modular multi-level converter (mmc) flexible direct current power transmission system valve fault current assay device
Reason figure, this device is made up of decay current infusion circuit, sinusoidal current infusion circuit and high voltage infusion circuit, as shown in Figure 1.
The first control valve s in decay current infusion circuit1, the first bidirectional control valve s in sinusoidal current infusion circuit3
With the second bidirectional control valve s in high voltage infusion circuit4It is connected with the outfan of tested valve respectively；Decay current infusion circuit
Low-pressure end, the low-pressure end of sinusoidal current infusion circuit and high voltage infusion circuit the low-pressure end low-pressure end with tested valve respectively
It is grounded after being connected.
Decay current infusion circuit includes the first power supply u1, the first charge switch k1, the first direct current capacitors c1, first negative
Carry reactor l1, damping resistance r1, the first control valve s1, turn-off device g, bleeder resistance r2, and diode d；First power supply
u1Through the first charge switch k1With the first direct current capacitors c1Connect；Turn-off device g and bleeder resistance r2Parallel connection, with two poles
Pipe d connects, and forms gr-d branch road；Gr-d branch road is through the second control valve s2With the first direct current capacitors c1In parallel；Gr-d branch road is through
One load reactance device l1, damping resistance r1With the first control valve s1It is connected with the outfan of tested valve.
Sinusoidal current infusion circuit includes second source u2, the second charge switch k2, the second direct current capacitors c2, second negative
Carry reactor l2With the first bidirectional control valve s3；Second source u2Through the second charge switch k2With the second direct current capacitors c2Even
Connect；Second direct current capacitors c2Through the second load reactance device l2With the first bidirectional control valve s3It is connected with the outfan of tested valve
Connect.
High voltage infusion circuit includes the 3rd power supply u3, the 3rd charge switch k3, the 3rd direct current capacitors c3, the 3rd load
Reactor l3With the second bidirectional control valve s4；3rd power supply u3Through the 3rd charge switch k3With the 3rd direct current capacitors c3Connect；
3rd direct current capacitors c3Through the 3rd load reactance device l3With the second bidirectional control valve s4It is connected to the outfan of tested valve.
Tested valve is by some submodule sm1～smnIt is connected in series；Submodule sm1Including electric capacity c, two insulated gate bipolars
Transistor igbt1 and igbt2 and IGCT t；Electric capacity c, controlled shutoff device igbt1, igbt2 are sequentially connected in series closed loop
Structure；Igbt2 and IGCT t is in parallel.
First power supply u1, second source u2With the 3rd power supply u3It is respectively the first direct current capacitors c1, the second direct current capacitors
c2With the 3rd direct current capacitors c3Charge；Trigger the first control valve s1, the second control valve s2, by the first direct current capacitors c1With
One load reactance device l1, damping resistance r1Resonance produce front end peak current, by the first load reactance device l1, damping resistance r1、
First control valve s1, the second control valve s2And tested valve group becomes decay current infusion circuit, produce decay current；Control can be closed
Disconnected device g conducting is so that the first load reactance device l1By damping resistance r1Electric discharge, forms exponential decay current, is loaded by first
Reactor l1, damping resistance r1, tested valve, turn-off device g, diode D-shaped become decay current infusion circuit, produce decay electricity
Stream.
Trigger two-way first bidirectional control valve s3, the second direct current capacitors c2, the first load reactance device l2, the first two-way control
Valve s processed3Form sinusoidal current infusion circuit with tested valve, produce sinusoidal current, by the first control valve s1, the second control valve s2
With the first bidirectional control valve s3The cooperation of triggering logical sequence, makes decay current reach time of peak value and first sinusoidal current
The time that pulse reaches peak value is identical, and decay current continues to be superimposed with sinusoidal current to put on tested valve；Needing to apply instead
During to voltage, control and turn off turn-off device g, decay current infusion circuit is exited from circuit, after sinusoidal current zero passage,
Lock-in control valve s3Pulse, sinusoidal current infusion circuit exits from circuit, then triggers the second bidirectional control valve s4By high voltage
Infusion circuit puts into, and backward voltage is put on tested valve, until off-test.
Can independent work by these three to decay current infusion circuit, sinusoidal current infusion circuit and high voltage infusion circuit
The sequencing contro of the rssi circuit made, makes tested valve tolerate with the equally severe proof strength of actual condition, realizes fault current
The purpose of test.
Claims (3)
1. the failure operation assay device of a kind of flexible direct-current transmission valve, described device includes decay current infusion circuit, sine
Electric current infusion circuit and high voltage infusion circuit；The outfan of tested valve is electric with described decay current infusion circuit, sine respectively
Multiple abscess entry loop and high voltage infusion circuit connect；The low-pressure end of described decay current infusion circuit, sinusoidal current infusion circuit
Low-pressure end be connected with the low-pressure end of tested valve respectively with the low-pressure end of high voltage infusion circuit after ground connection；
Decay current infusion circuit includes the first power supply (u1), the first charge switch (k1), the first direct current capacitors (c1), first
Load reactance device (l1), damping resistance (r1), the first control valve (s1), turn-off device (g), bleeder resistance (r2), and two poles
Pipe (d)；First power supply (u1) through the first charge switch (k1) and the first direct current capacitors (c1) connect；Turn-off device (g) with
Bleeder resistance (r2) in parallel, then connect with diode (d), form gr-d branch road；Gr-d branch road is through the second control valve (s2) and first
Direct current capacitors (c1) in parallel；Gr-d branch road is through the first load reactance device (l1), damping resistance (r1) and the first control valve (s1) with
The outfan of tested valve is connected；
Sinusoidal current infusion circuit includes second source (u2), the second charge switch (k2), the second direct current capacitors (c2), second
Load reactance device (l2) and the first bidirectional control valve (s3)；Second source (u2) through the second charge switch (k2) and the second direct current
Capacitor (c2) connect；Second direct current capacitors (c2) through the second load reactance device (l2) and the first bidirectional control valve (s3) with
The outfan of tested valve is connected；
High voltage infusion circuit includes the 3rd power supply (u3), the 3rd charge switch (k3), the 3rd direct current capacitors (c3), the 3rd negative
Carry reactor (l3) and the second bidirectional control valve (s4)；3rd power supply (u3) through the 3rd charge switch (k3) and the 3rd unidirectional current
Container (c3) connect；3rd direct current capacitors (c3) through the 3rd load reactance device (l3) and the second bidirectional control valve (s4) connect
Outfan in tested valve；
The first control valve (s in described decay current infusion circuit1), the first double-direction control in sinusoidal current infusion circuit
Valve (s3) and high voltage infusion circuit in the second bidirectional control valve (s4) be connected with the outfan of tested valve respectively；Decay current
The low-pressure end of the low-pressure end of infusion circuit, the low-pressure end of sinusoidal current infusion circuit and high voltage infusion circuit respectively with tested valve
Low-pressure end be connected after be grounded,
The work process of described failure operation assay device is as follows:
A, the first power supply (u1), second source (u2) and the 3rd power supply (u3) be respectively and inject back to the decay current of described device
First direct current capacitors (the c on road1), the second direct current capacitors (c of sinusoidal current infusion circuit2) and high voltage infusion circuit
3rd direct current capacitors (c3) precharge, disconnect the first charge switch (k after the completion of precharge1), the second charge switch (k2) and the
Three charge switch (k3)；
B, by control turn-off device (g), the first control valve (s1), the second control valve (s2) triggering and conducting, turn off sequential, make
Obtain the first direct current capacitors (c1), the first load reactance device (l1), damping resistance (r1) be combined, produce decay current；Pass through
Trigger the first bidirectional control valve (s3), so that sinusoidal current infusion circuit is worked, produce sinusoidal current；
C, trigger the cooperation of logical sequence by described decay current infusion circuit and sinusoidal current infusion circuit, make decay current
It is superimposed with sinusoidal current and put on tested valve；
D, shutoff turn-off device (g), decay current infusion circuit is exited from circuit；Turn off the first bidirectional control valve (s3)
Trigger pulse, after sinusoidal current zero passage, sinusoidal current infusion circuit exits from circuit；In trigger high voltage infusion circuit
The second bidirectional control valve (s4), high voltage infusion circuit is put into, backward voltage is put on described tested valve,
It is characterized in that, in described step b, trigger the first control valve (s in described decay current infusion circuit1), second control
Valve (s processed2) so that the first direct current capacitors (c1) to the first load reactance device (l1) and damping resistance (r1) charge, treat the second control
Valve (s processed2) sufficiently conductive after, that is, turn off its trigger pulse；Control the triggering moment of turn-off device (g) so that first loads
Reactor (l1) pass through damping resistance (r1) afterflow；Decay current infusion circuit is operated in both of which, produces decay current, by
Decay current infusion circuit injects decay current.
2. the failure operation assay device of flexible direct-current transmission valve as claimed in claim 1 is it is characterised in that described step c
In, trigger the first bidirectional control valve (s of described sinusoidal current infusion circuit3), by sinusoidal current infusion circuit, produce sinusoidal electricity
Stream, by described first control valve (s1), the second control valve (s2) and described first bidirectional control valve (s3) triggering logical sequence
Cooperation, make described decay current reach peak value time identical with the time that first sinusoidal current pulse reaches peak value, afterwards
Decay current continues to be superimposed with sinusoidal current to put on described tested valve.
3. the failure operation assay device of flexible direct-current transmission valve as claimed in claim 1 is it is characterised in that described step d
In, when applying backward voltage, control and turn off turn-off device (g) so that continued flow resistance becomes big, inductive discharge is accelerated, described
Decay current infusion circuit exits from circuit, turns off the first bidirectional control valve (s3) trigger pulse, treat sinusoidal current zero passage
Afterwards, described sinusoidal current infusion circuit exits from circuit, then triggers described second bidirectional control valve (s4) high voltage is injected
Loop puts into, and backward voltage is put on described tested valve, until off-test.
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| CN201410109433.0A CN103837827B (en) | 2014-03-22 | 2014-03-22 | Fault operation test device of flexible direct current transmission valve |
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| CN201410109433.0A CN103837827B (en) | 2014-03-22 | 2014-03-22 | Fault operation test device of flexible direct current transmission valve |
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| CN103837827B true CN103837827B (en) | 2017-01-18 |
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